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The compact disc manufacturing process started with a digital master tape, transported from the studio under heavy security. This tape was cloned in a clean room using a glass production mold, then locked away in a secure room. Next, the replication process began, as virgin discs were stamped with the production mold into bit-perfect copies. After replication, the discs were lacquered and sent to packaging, where they were “married” to the jewel cases, then combined with liner notes, inlays, booklets, and any other promotional materials. Certain discs contained explicit lyrics, and required a “Parental Advisory” warning sticker, and this was often applied by hand. Once finished, the packaged discs were fed into a shrink-wrapper, stacked into a cardboard box, and taken to inventory to await distribution to the music-purchasing public.
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Stephen Witt (How Music Got Free: The End of an Industry, the Turn of the Century, and the Patient Zero of Piracy)